On the subject of propane flow restriction.....
I just found this 'Not Your Father's Pigtail!' article which explains where the flow-limiting device is and how it works. It's a bit of a slog to read through but I thought it may be interesting to anyone looking for more detail.
I believe the flow-limiting device is also called an 'excess-flow valve' in some contexts. We see the words 'excess flow' associated with the Quick Closing Coupling (QCC) adapters in this LPG equipment-supplier catalog.
And here's even more reading for those interested in the details of propane tank valves and connectors.. ACME or POL valve required for RV propane cylinders and cylinder recertification. I include this info as some of us (like me!) still have a left-hand-thread POL connector on our regulator pigtail line (the one from the regulator to the tank) and this article provides background on the transition from POL to ACME.
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Edited by Old Crow, 14 November 2018 - 05:58 PM.